So I've reached about level 10 right now, and one feature I realy miss is the Surrender-option. Sometimes you can tell a loss a few rounds in advance, but the only options avibale is to disconnect/quit, or to use all you remaining moves to delete your own stuff so the opponent can win faster. Neither is very good.

Now this might be me missunderstanindg everything, but a "quit" seems to register like a disconnect, or am I wrong? If im wrong, then you know ->
But if im right, then it's rather clunky.

Surrender buttons were discussed during dev, but it would add another layer of ease for people padding MP stats (starting 2 games on one comp, etc). While I agree that sometimes you just want it to end, the flipside is that it makes it quite easy to pad.

Because it robs your opponent of the victory he earned, and ethical, self-respecting players don't want to do that?

Oh please, it doesn't rob anything. That would be like saying in war, the victor doesn't win until he's killed every last enemy human being. Surrender is the same as victory, you just don't get the satisfaction of wasting your opponent's time.

That would be like saying in war, the victor doesn't win until he's killed every last enemy human being.

Not really. The goal of a war is not to win the war, it's something outside the war - like conquering some territory. The goal of a game is to win. While I personally do not care whether the opponent surrenders or fights to the end, it is quite reasonable that some people would in fact care.
I believe it should just be a yes/no prompt when the opponent offers surrender.